Bolt-threading machine



(No Model.)

' J. A. BEGHER.

BOLT THREADING MACHINE. I N0. 377,981. I Patented Feb. 14,1888

WITNESSES Attorney UNITED STATES PATIENT OFrrca JAMES A. BEGHER, OF MIs AWAKA, INDIANA.

BOLT-T HRE ADING MACHINE.

SPECIFICATION forming part of Letters Patent NO. 377,981, dated February 14, 1888.

Application filed May 9, 1887. Serial No. 237,610. (No model.)

To aZZ whom it may concern.-

Be it known that I, JAMES A. BECHER, of Mishawaka, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Bolt-Threading Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification, in which- Figure l is a top view of a bolt-threader stock having my improvements applied. Fig. 2 is a detail enlarged cross-sectional view of one of the cutter-heads attached to its jaw.

Fig. 3 is an enlarged central longitudinal section of the same. Fig. i is a view of one of the detachable heads. Fig. 5 is a detail view showing the manner of making the cutters.

sists in the novel construction and arrange ment of. arts, hereinafter described, illustrated in the drawings, and particularly specified in the appended claims.

. The invention is especially applicable to thread-cutting machines in which the dies or cutters are mounted on the ends of a series of angular lever arms or jaws pivoted to the spindle on the stock of the machine and operated by suitable means to set the cutters farther in or out to vary the depth of cut, or to suit varying sizes of bolts.

Referring to the accompanying drawings by letter, A- designates the spindle or stock of a bolt-threading machine, provided with the lever-jaws B, as usual. These parts are of common construction, and further description thereof is unnecessary, promising, however, that instead of employing three or more jaws B, two only are required by the use of rnyimprovements, as shown in the drawings, so that the cost of the machine is reduced, although the usual number of jaws may be employed, if desired. g

In the outer face or head of each jaw B is formed one or more grooves, 12, which maybe dovetailed -in cross-section, if desired, or of other convenient form, and which grooves are made on lines radiating from the axial line of the rotation of stock A. r

a designates a threaded recess formed vertically in the head of jaw B at the bottom of groove 1), near the outer end thereof, and hereinafter referred to.

G G designate the cut ter-h oldi n g heads, which are removably secured on jaws B. Each head ing through rib D is formed a vertical open ing, (1, through which passes the shank of a bolt or screw, E, which engages the opening a in the jaw upon which its head 0 is placed, and securelylocks the head on the jaw, the rib D preventing side displacement and the bolt E lateral or vertical displacement of the head in relation to its jaw.

On the front upper surface of head 0 is formed the cutter-seat by the two opposite parallel ribs F F and connecting transverse rib f,which is situated near the opening d, the front space between the ribs E E being left open.

a designates a screw threaded opening in head 0 below the cutter seat, and hereinafter referred to.

G G designate the cutters, two of which are mounted on each head. These cutters are similar, but face in opposite directions. Each consists of a rectangular bar having itsouter front corners beveled off, and having on its inner face, below this bevel, a semicircular recess. so that an arm, g, is formed at the front end of each cutter, the face of the arm 9 standing at right angles to the body of the cutter and being suitably marked or scored to produce 1 the threads on the bolts, as shown.

H designates semicircular notches formed in the cutters G on the same side as the notches I and 4.

J designates a set screw passing through a threaded opening in rib f and abutting against the base of a cutter G, so that a slight longitudinal adjustment can be given the cutters, and they can be thereby additionally locked against bolts I.

The manner of making cutters G is as follows: I take two bars, K K, of steel of proper width and thickness for forming heads G, and dowel them together lengthwise, as shown in Fig. 5. I then bore a small opening, it, in the line of junction of bars K K, so that half of said opening will be in each bar. Then on each side of openingk, I form larger openings, Z l, and at proper distances from openings Zare made similar openings, it. These openingsl and It, being bored on the line of junction of bars K K, will lie equally in each bar, as is evident. These series of openings are formed in the bars at proper distances apart, the dis tance between openings k k corresponding to the length of two cutters G, the bars being properly notched transversely and centrally between openings 7a to separate the sections from each other. After the bars K K have been thus bored and notched throughout their length, the openings k are bored with proper taps to form the cutting-edges of the cutters.

The V-shaped notches L L are made in each bar K opposite to and terminating at opening it, as shown. The bars are then separated from each other and divided at the various notches, presenting the completed cutters G, as described. By this method of forming the cutters they can be made readily, cheaply, and quickly, and flaws in the cutters can be avoided by properly matching and selecting bars K. The holes h, formed in bars K K while united when the bars are separated form the notches H of the cutters, and the notches L and openings-Z and it give the proper shape to heads 9.

It will be observed that when the cutters become dull from use they can be removed from heads 0 and properly ground on the outer or inner edges of their heads 9 by an ordinary grindstone or emery-wheel, obviating the necessity of special tools for this purpose.

The operation of the device is obvious from the foregoing.

In practice it is proposed to provide a pair of heads 0 with theproper cutters G for the varying pitches of threads to be cut, the cutters being properly adjusted on the heads 0 and rigidly locked thereon, as described, so that when it is desired to change the pitch of the thread or to thread varying sizes of rods the heads 0 can be detached from jaws B and others substituted, so that the only time lost will be the little required to substitutev the heads 0, as the tool will be properly adjusted pair or cutter will make the rough cuts and I the following pair the finishing cuts, so that the bolt will come from the machine properly dressed and finished.

Having described my invention, I claim- 1. In a bolt-threading machine, the combination, with the spindle-shank and the jaws secured thereto, of detachable sliding heads removably mounted on said jaws and the cutters secured on said heads, all substantially as and for the purpose described. 2. In a bolt-threading machine of the character described, the combination,with the pivotal jaws B, having the radial slots in their outer faces,of detachable cutter-bearing heads having ribs on their under surfaces engaging the slots in the jaws, and means for locking the heads in these slots, substantially as set forth.

3. In a bolt-threading machine, the combination, with the spindle-shank and its jaws, of detachable sliding cutter-bearing heads secured on said jaws and detachable cutters adjustably secured on said heads, all substantially as specified.

4:. The combination,in a bolt-threading machine, of the'jaws B, having grooves 23 in their outer faces, heads 0, removably secured to the jaws and having ribs D engaging the grooves b, with detachable cutters G, secured to the heads 0, all constructed substantially as and for the purpose described.

5. In combination with the cutter-bearing heads of a bolt-threading machine, substantially as described, the cutters G, constructed and arranged to operate substantially in the manner and for the purpose set forth.

6. The combination, with jaws B and detachable heads 0, mounted thereon and having the upstanding flanges F, F, andf, forming the cutter-seat, of the cutters G, having heads 9, notches H, and suitable means for retaining them in their seats on heads 0, all constructed and arranged to operate substantially in the manner andforthe purpose specified.

7. In a bolt-threading machine, the combination of the detachable heads 0, having ribs F, F, and f, forming the cutter-seat, opening a in said seat, and adj usting-bolt J, with the similar opposite cutters, G, having heads 9 g, and adjoining notches HH, and the bolt I, passing through notches H H and engaging in opening 0 of the cutter-head, all constructed and arranged substantially as and for the purpose described.

In testimony that I claim the foregoing as my own I aflix my signature in presence of two witnesses.

JAMES A. BEOHER.

Witnesses:

J AMES DUSHANE, J EANIE ANDERSON. 

